Interface StatementCallback<T>

public interface StatementCallback<T>

Generic callback interface for code that operates on a JDBC Statement.
Allows to execute any number of operations on a single Statement,
for example a single executeUpdate call or repeated
executeUpdate calls with varying SQL.

Used internally by JdbcTemplate, but also useful for application code.

Method Detail

doInStatement

Gets called by JdbcTemplate.execute with an active JDBC
Statement. Does not need to care about closing the Statement or the
Connection, or about handling transactions: this will all be handled
by Spring's JdbcTemplate.

NOTE: Any ResultSets opened should be closed in finally blocks
within the callback implementation. Spring will close the Statement
object after the callback returned, but this does not necessarily imply
that the ResultSet resources will be closed: the Statement objects might
get pooled by the connection pool, with close calls only
returning the object to the pool but not physically closing the resources.

If called without a thread-bound JDBC transaction (initiated by
DataSourceTransactionManager), the code will simply get executed on the
JDBC connection with its transactional semantics. If JdbcTemplate is
configured to use a JTA-aware DataSource, the JDBC connection and thus
the callback code will be transactional if a JTA transaction is active.

Allows for returning a result object created within the callback, i.e.
a domain object or a collection of domain objects. Note that there's
special support for single step actions: see JdbcTemplate.queryForObject etc.
A thrown RuntimeException is treated as application exception, it gets
propagated to the caller of the template.

Parameters:

stmt - active JDBC Statement

Returns:

a result object, or null if none

Throws:

SQLException - if thrown by a JDBC method, to be auto-converted
to a DataAccessException by a SQLExceptionTranslator